DOCUMENT AND ENTITY INFORMATION	3 Months Ended
	Oct. 31, 2012	Dec. 07, 2012
Entity Registrant Name	GENEREX BIOTECHNOLOGY CORP
Entity Central Index Key	0001059784
Current Fiscal Year End Date	--07-31
Entity Filer Category	Accelerated Filer
Trading Symbol	gnbt
Entity Common Stock, Shares Outstanding		372,059,685
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2012
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2013